Nut-lock.



PATBNTED JUNE 1a, 1907.

A. H. KNUFF.

NUT LOCK.

.ra/62x55?? mw KW UNITED STATES. P'rEN'r. OFFICE.

ALBERT ILKN OPF, OF OAK HALL, PENNSYLVANI, ASSIGNOROF ON lil-HALF T() CHARLES M. MCCURDY, 0F 'BELIiEFON-TE', PENNSYLVAIA.

Nur-Lock. Y

Patented June 1s, ico?.

Application no1 rebmry r, 19o?. serial no.. 356,210.

To a/Z/ whom it may concern:

Be it known that I, ALBERT H. Knorr, a citizenof the United States, residing at Oak. Hall., Centre county, Pennsylyania, have invented a new and useful Improvement in N ut-Looks, of which the following is a speciiication.

My invention relates to that type of nut locks in which a plurality of locking nuts are employed, adapted Vto interlock or be held in tight engagement with each other and with the threaded surfaces of the bolt with which they engage.

' I shall n ow describe my invention so that others skilled in the artmay manufacture and use the same, reference being had to the accompanying drawing, forming part of this specification, in which Figure 1 is a view showing the various parts of the device assembled, the bolt be ing shown in full lines and the nuts in sect-ion. Figs. 2, 3, and 4, are sectionalviews of the nuts detached. 'Y

Like symbols of reference indicate like parts in each.

In the drawing, 2 represents a bolt, provided preferably with Y left-hand screwthreads 3, and having at its end an extension 4 furnished with right-hand screw-threads 5.

6 is a nut having interior left-hand screwthreads 7 adapted to engage with the lefthand screw-threads 3 of the bolt 2, and hav` ing a shoulder 8 provided with right-hand screw-threads 9, Y Y Y 10 is a nut, preferably of the same'diameter as the bolt 2, and having a threaded bore 11 adapted to engage with the threaded extension 4 of the bolt, and having also a threaded outer surface 12, the threads of which are lessin number to the inch than the threads of the bore 11 and are reversel'y inclined toV the threads 3 of the bolt. 13 is a nut having a threaded bore 14 adapted to engage with the. threads 12 of the nut 10 and a larger threaded bore 15 adapted to engage with the threads() Vof the nut 6. Y

y The arts of my improved device are assemble in the following mannert-The nut 'is'irst screwed to place on the bolt 2, its left-handed screw bore 7 engaging with the left-handed screwthreads 3 ofthe bolt. The# nut 10 is now screwed tightly to place on the extension 4 of the bolt with its inner end abutting against the end 16 of the larger portion` of the b olt. Y The nut 13 is now screwed to place its smaller threaded bore 14 engagmg with the threaded surface 12 of the nutl 10, audits larger threaded bore 15 engaging with the threaded shoulder 9 of the nut 6. The nut 10 is then by means of a wrench inserted into therecesses 17 in its outer end, or in any other suitable manner, loosened slightly. This vslight loosening of the nut 10 throws the threads 12 of the nut 10 a little out' of register withthe threads 14 of the n ut 13, While. the threads 15 of said nut 13- remain in register 'with the threads 9 of the nut 6, and consequently the nut 13 cannot he unscrewed from its engaging surfaces, much less become I loose accidentally. At the same time the difference in the pitch of the threads 11 and 12, or rather because said threads differ inthe number to the inch, prevents said nut from independently u-nscrewing, but will not prevent said slight loosening referred to above. The several nuts are thus held irmly on the bolt. To disengage the same, the nut 10 is a ain tightened up against the end 16 of the bo t, when the several parts may be easily removed.

1. In a nut-lock, a bolt having screwthreaded portions of different diameters, a nut ada ted toV engage f the inner :screwthreadedp portion, a nut ada ted to engage the outer screW-'threadedportion and having an exterior screw-threaded portion differing in the number of screw threads tothe inch from its interior screw-threaded surface, and a nut ha screw-threads adapted to make substantially as described.

3. In a nut-lock, a bolt having a body portionV rovided. with screw-threads', and an integra extension of less diameter than the body portion and -provided with `screws'creW-thre ed engagement with said bolt- IOO threads reversely inclined to those of the? body ortion, a nut ada ted to be screwed on said) body portion of t e bolt and having exterior screw-threads reversely inclined to its interior serewthreads, a not adapted to be screwed on to said integral bolt extension and havi u' exterior screw-threads differing in the num r of threads to the inch from its interior Screw-threads but ofk the same inf olination, and "a nut adapted to be screwed on said last named not. and ha 7 u au enlarged bore at itis inner end provwrliled with screw-threads adapted to eng e with the exterior serew-threads of thearst named ut; substantially as described. 4. In a nut-leek, a bolt having a body portion provided with left-hand screw-threads `and an integral extension of less diameter the bodjyr portion and provided withV nghtehand screw-threads, a nut adapted to be screwed on the bodyportion of the bolt. a nut adapted to be tension` and having exterior rightha11d screw-threads diering threads to the inch from its interior screwthreads, and anni; adapted to make screwthlreaded ngagement with said bolt-nuts;

substantially as described.

testimony wliereof I have hereunto set my hand. l

ALBERT H. KNUFF. "Wimesses;:`

H. C. QULGLEY, BERTHA A. LAUBIE.

in the number Vof- Vscrewed on said bolt ex- 

